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Using the InvokeWebService Activity
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WF s built-in client-facing XML Web service support comes in the form of the InvokeWebService activity. In many respects, the InvokeWebService activity merely fronts a proxy for you, but it does have added capability to control multiple invocations using a single session cookie.
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18
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Invoking Web Services from Within Your Workflows
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The crucial properties you need to work with when using the InvokeWebService activity are shown in Table 18-1.
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Table 18-1 Critical InvokeWebService Activity Properties Property MethodName Purpose Gets or sets the method to be invoked when the activity is executed. This property represents the method name of the remote method you want to call. Gets or sets the type name for the proxy class. Either you can provide this yourself or WF will help you by creating a proxy class for you when you drop the activity into your workflow. Gets or sets the session to be used. You use this mechanism to tie different XML Web service invocations together. I discuss this property further in the Working with Sessions section. Gets or sets the URL to be used for communicating with the XML Web service. The URL itself is stored in your workflow project s Settings property bag, although you can easily change it using the Properties pane for your InvokeWebService activity instance.
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ProxyClass
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SessionId
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In addition to these properties, you might also from time to time need to provide event handlers for the Invoking and Invoked events. You ll see why you might need these when you configure your proxy in this chapter s Configuring the Proxy section. Using the InvokeWebService activity is simply a matter of dropping it into your workflow. When you do, Microsoft Visual Studio helps you configure the activity by requesting the server information so that it can retrieve the WSDL and create the proxy. If you want to create the proxy yourself, simply cancel the dialog box Visual Studio pops up. If you want Visual Studio to create the proxy, you ll recognize the dialog box as the same dialog box Visual Studio uses for selecting a Web reference for a typical Visual Studio project, as you see in Figure 18-1.
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Figure 18-1 Visual Studio s Add Web Reference dialog box user interface
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Part IV
External Data Communication
Once you add the Web reference, you need to assign the MethodName from the list of available methods and bind any parameters that might be required. Once you do, you re ready to go.
Adding the Web Reference
As Figure 18-1 indicates, there are four ways to assign an XML Web service binding to your InvokeWebService activity. The three links are clear: Select a Web service from your current solution, select a Web service from your local machine, or use something known as UDDI to locate a Web service hosted on a server in your local network. The fourth way, of course, is to type the URL directly in and press the Go button. Note
UDDI is the Universal Description, Discovery, and Integration protocol, which is used to publish the existence and capabilities of XML Web services. At one time, it was intended for Internet-wide use, but that idea has since fallen short of expectations. However, you can use UDDI on your local network if you re using Windows Server 2003. The following online information source tells you how: http://www.microsoft.com/windowsserver2003/technologies/ idm/uddi/default.mspx.
If you select the local solution link (the first link in the list of options), Visual Studio inspects your current solution for XML Web service projects. If any are found, they re presented to you and you can choose one to bind to (by clicking the Add Reference button, which will be enabled once you select a service). Choosing a service from your local server tells Visual Studio to scan the local Internet Information Services (IIS) metabase for XML Web services configured to execute under local IIS control. If any are found, they re presented in a list for you to select the service you desire. Again, once you select a service, the Add Reference button is enabled. Click it and Visual Studio creates your proxy for you. Note if you want to reference a WSDL file located on your local hard drive, you need to type that into the URL field by hand using the file protocol (file://{filename}). As for using UDDI, if you select this option and there is at least one UDDI server available in your local network, you can use the UDDI services it provides to seek and select an XML Web service of interest. Having found one, UDDI provides Visual Studio with the relevant service URL, and Visual Studio again creates your proxy for you. Something to keep in mind when you add Web service references is that you have the option of assigning names to the proxies when you select the service. This option can be useful, especially when you reference more than one service. The name you provide becomes part of the proxy s namespace. If your Web service is truly out there in the land of the Internet, you need to provide the URL yourself by typing it into the URL field that you see at the top of the dialog box shown in Figure 18-1 and clicking the Go button. Visual Studio queries the URL for its WSDL and builds the proxy just as if the XML Web service were local to your system.
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